cis (mathematics)
Alternate mathematical notation for cos x + i sin x / From Wikipedia, the free encyclopedia
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cis is a mathematical notation defined by cis x = cos x + i sin x,[nb 1] where cos is the cosine function, i is the imaginary unit and sin is the sine function. x is the argument of the complex number (angle between line to point and x-axis in polar form). The notation is less commonly used in mathematics than Euler's formula, eix, which offers an even shorter notation for cos x + i sin x, but cis(x)
is widely used as a name for this function in software libraries.
"Cisoidal oscillation" redirects here. For the plane curve generated from two curves, see Cissoid.